Joe and Patti journey to Philadelphia, home of Greensgrow Farms, fulfillment of the dream of visionary in urban farming, Mary Seton Corboy. More than ten years ago a city block in the Kensington area was the site of an abandoned galvanized steel plant and an EPA brownfields project (see below) that the neighborhood had given up on. But not Mary. Beginning the experimental transformation she was growing lettuce hydroponically (growing plants in a water and nutrient solution without soil) for her clients; high-end local restaurants in need of fresh, organic produce. But the one attribute she prides herself on is her ability to change.